Flatfoot test is an ankle examination procedure that tests for pes planus, flatfoot trauma or fallen medial longitudinal arch.
Patient should be awake and cooperative to perform the Flatfoot test.
- Patient should be standing for this procedure.
- Patient’s weight should be evenly distributed on each leg.
- The examiner uses a straight edge such as a ruler or pen at the inferior apex of medial malleolus and medial surface of the base of the 1st metatarsal.
- The examiner locates the navicular tuberosity and compares its location using the straight edge.
Positive Flatfoot test
There is positive Flatfoot test when the navicular tuberosity is below the straight edge. This could indicate the presence of pes planus, flatfoot or medial longitudinal arch.
There are different grades of flatfoot:
Grade 1: Navicular tuberosity falls 1/3 of distance to the floor.
Grade 2: Navicular tuberosity falls 2/3 of distance to the floor.
Grade 3: Navicular tuberosity touching the floor.
Clinician’s option: The examiner may also check the arch height by placing a finger under the arch.